linux-kernel - Re: [PATCH] kthread: add kthread_mod_pending_delayed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210216091128.GA3973504@infradead.org>
Date:   Tue, 16 Feb 2021 09:11:28 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Yiwei Zhang <zzyiwei@...roid.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Jens Axboe <axboe@...nel.dk>, Petr Mladek <pmladek@...e.com>,
        "J. Bruce Fields" <bfields@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Ilias Stamatis <stamatis.iliass@...il.com>,
        Rob Clark <robdclark@...omium.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Liang Chen <cl@...k-chips.com>, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [PATCH] kthread: add kthread_mod_pending_delayed_work api

On Sun, Feb 14, 2021 at 12:06:11AM +0000, Yiwei Zhang wrote:
> The existing kthread_mod_delayed_work api will queue a new work if
> failing to cancel the current work due to no longer being pending.
> However, there's a case that the same work can be enqueued from both
> an async request and a delayed work, and a racing could happen if the
> async request comes right after the timeout delayed work gets scheduled,
> because the clean up work may not be safe to run twice.

Who is going to use this?  Please submit it together with the actual
user.